Strategy for selling a house - what is the best way to proceed?

Since I have difficulty with it, I called the agents for an assessment :)

You now have the assessments. What else do you need? ;-)

I don't want to ask for unrealistic prices and then possibly have to correct the purchase price..

May I ask what would be wrong with that? My husband and I did the same. There's nothing wrong with it. I know that on the usual marketing sites it is advised against, but I don't see the problem with it.

There are many buyers who observe the market in the form of listings with their search criteria for a longer period. When they see that the price is falling, they believe (correctly?) that the seller does not have all the time in the world and see an opportunity for further negotiations. Or they suspect a catch that will only become visible later on, which is why no one is really willing to buy the property. Those who think this way are immediately completely deterred. Ultimately, a price reduction always reveals a compulsion to act on the part of the seller. This weakens their negotiating position. How much, in turn, depends on the location and the property.

This is not a basis for negotiation. Politely dismiss it.

Yep, exactly! In my opinion, that's bordering on cheekiness. but done!

It is psychologically difficult nowadays to pay a significantly higher price for something comparable to the "own" than at the time of the original purchase.

Yes, that's exactly it. He probably had his purchase price from 5 years ago in mind.. tough luck!

You now have the assessments. What else do you need? ;-)

May I ask what would be wrong about that? My husband and I did that too. There’s nothing wrong with it. I know that it is usually discouraged on the common marketing sites, but I don’t see the problem with it.

Tolentino put it very well!

There are many buyers who observe the market through listings with their search criteria for a longer time. When they see the price dropping, they assume (correctly?) that the seller does not have all the time in the world and see a starting point for further negotiations. Or they suspect a catch that only becomes visible later on, which is why no one is really willing to buy the property. Those who think like this are immediately put off.
Ultimately, a price reduction always reveals pressure to act on the part of the seller. That weakens their negotiating position. How much depends, again, on the location and the property.

Because I acted exactly like that... While we were searching for a house, I knew every property. Prices were sometimes adjusted so many times that I suspected something was wrong.

The only thing we are still considering now is when it is smart to list the house. Will there be people who will wait almost 15 months for an existing house? Or better list it when construction begins?

A previous sale with a move definitely does not come into question!

If you see that the price is falling, you assume (correctly?) that the seller does not have all the time in the world and see a point of departure for further negotiations.

Interested parties are welcome to see a point of departure for negotiations, as the seller decides at what price he sells to whom.

Or they suspect a catch that only becomes visible later, which is why no one is really willing to buy the property. Those who think this way are immediately discouraged.

Maybe I see it too relaxed, but I always assume that even house sellers "just make mistakes" or have ideas that do not align with those of others. From my point of view, this is more normal than particularly remarkable.

Ultimately, a price reduction always reveals pressure to act on the part of the seller.

I also rather see that even the sales listing is already an indication of the seller’s "pressure to act." In principle, the seller says with his listing that he has something he no longer wants.

But I am not an expert and you are probably right with your assessments.

I am not a professional either (in the sense of a real estate agent or similar). But at least I am in sales.
By no means does simply posting a listing already imply a compulsion to sell on the part of the seller. Rented properties, for example, could be listed, and whether they are sold within 3, 6, or even 12 months can be irrelevant to the seller, as long as it is not a closed-end fund.
By compulsion to sell I mean something like needing the sale amount at time x, otherwise I cannot make my next financing / otherwise it leads to a forced auction / otherwise I am insolvent, etc.
I once listed my mother’s apartment (in consultation with her) just to see what was possible. A lot of inquiries came in within a very short time. She then changed her mind, but theoretically there was absolutely no compulsion to sell for the reasons mentioned above. In the end, we could probably have sold the apartment unrenovated with a 70% increase in purchase price.

I don’t have the perfect plan either, but I have seen listings where exactly this was discussed. That is, either it can be sold immediately, but the handover is to take place later (the corresponding rent can either still be paid or is already included in the sale price) or the sale is initiated with the goal only at time x. The latter would be unpleasant for me as a seller because I wouldn’t know whether the buyer might back out. Therefore, I would prefer the first option (which does not make calculating the appropriate price any easier) or option two with a corresponding reservation fee (€2,000?) which can be credited towards the purchase price.

Overall, I would probably not list now but wait a little longer. But not too long either, because from the first viewing to the final notary appointment a few months can pass even under normal circumstances if everyone agrees. further viewings / with experts, financing by the buyer, possibly a bank appraisal needed, then finding a notary, contract drafting approved by buyer and seller.
Three to six months can quickly pass, even if everyone tries to be fast.
Maybe wait another half year?
Then you will also know more about whether your construction schedule will actually be met. Because what do you do if the handover is firmly agreed upon at time X (in the notary contract!), but it turns out the construction is delayed by x months.
In that case, I would keep a sum in reserve anyway, in case you need to store your household and move into the holiday apartment...